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Z y) ÚCMACz¼A CMAC hash object.
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Do not instantiate directly. Use the :func:`new` function.
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:ivar digest_size: the size in bytes of the resulting MAC tag
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:vartype digest_size: integer
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z r t! | j" |« | _ nt! | j" « | _ |j ||j& | fi | j ¤| _ t+ |« | _ d | _ | | _ d | _ d | _ |r| j7 |« y y ) Né é i é é l zACMAC requires a cipher with a block size of 8 or 16 bytes, not %dó r é ) Ú digest_sizer
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block_sizeÚ _block_sizeÚ_mac_tagÚ_update_after_digestÚ _max_sizeÚ TypeErrorÚnewÚMODE_ECBÚ_ecbÚencryptr r Ú_k1Ú_k2ÚMODE_CBCÚ_cbcÚ bytearrayÚ_cacheÚ_cache_nÚ_last_ctÚ_last_ptÚ
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zero_blockÚLs r Ú__init__z CMAC.__init__3 s° ð #Ôä d¨CÓ0 Ø! Ø +ÔØ )× 4Ñ 4Ð4Ô2Ø Ø$7Ô!ð 7ØHØ *DNØ 2XØHØ +DNäð 8Ø:<ñ =ó >ð >ð r\
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Ø!IMM #Ø"+×"4Ñ"4ñ9à$(×$7Ñ$7ñ9 ð II× Ñ jÓ )Ü !:Ò Ü# A xÓ0DHä# ADHÜ Ó tÒ #Ü# D§H¡H¨hÓ7DHä# D§H¡HÓ-DHð "IMM #Ø"+×"4Ñ"4Ø",ñ9ð %)×$7Ñ$7ñ9 ô m Ø ð # ð ð á Ø KKÕ ð r c ó¨ | j | j s t d« | xj t |« z c_ | j
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t |« « }|d| | j | j | j |z | xj |z c_ | j |k r| S t |« |d }| j | j « d| _ t |« |z }|dkD r)| j |d| « || d | j d| n| j |« || _ | S )zAuthenticate the next chunk of message.
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Args:
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data (byte string/byte array/memoryview): The next chunk of data
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Nz4update() cannot be called after digest() or verify()r ) r$ r% r' r5 r r# r2 Úminr1 Ú
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memoryviewÚ_update)r7 r9 r ÚfillerÚremains r r6 z CMAC.updateo s% ð ==Ð $¨T×-FÒ-FÜÐ RÓSÐ Sà 3s8Ñ#Ø × Ñ à ==1Ò ÜdmmÑ+¬S°«XÓ6FØ>AÀ'À6¸lDKK d§m¡m°FÑ&:Ð ;Ø MMVÑ #Mà}}rÒ!Ø ä S/ & 'Ð*CØ LLÔ %Ø DMäSB Ø A:Ø LLXvg Ô 'Ø#&¨ w x =DKKÑ à LLÔ Ø Ø r c ó | j }t |« |z dk( sJ t |« dk( ry| j j |« }t |« |k( r | j }n
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|| dz | }|| d | _ t ||| d « | _ y)z,Update a block aligned to the block boundaryr Né )r# r r/ r+ r3 r r4 )r7 Ú
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data_blockr ÚctÚ second_lasts r rE z CMAC._update s ð × Ñ Ü: Ñ# qÒ(Ð(Ð(ä z?aÒ Ø à YY× Ñ zÓ *Ü z?bÒ Ø --Kà bS U B 3-KØB34 Ü {¨J¸°s°tÐ,<Ó= r c ój | j t « }| j j « |_ | j j
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| j | j j | j fi | j ¤|_
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| j dd |_ | j dd |_ |S )a+ Return a copy ("clone") of the CMAC object.
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The copy will have the same internal state as the original CMAC
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object.
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This can be used to efficiently compute the MAC tag of byte
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strings that share a common initial substring.
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:return: An :class:`CMAC`
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N) Ú__new__r Ú__dict__Úcopyr r( r r. r3 r! r/ r1 )r7 Úobjs r rP z CMAC.copy¢ s ð ll4Ó Ø}}×)Ñ)Ó+ Ø$4==×$Ñ$ T§Y¡YØ%)§]¡]×%;Ñ%;Ø%)§]¡]ñ<ð (,×':Ñ':ñ<ð [[¡^
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z z || j d t t | j |« | j « }| j j |« d| j | _ | j S )zóReturn the **binary** (non-printable) MAC tag of the message
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that has been authenticated so far.
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:return: The MAC tag, computed over the data processed so far.
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Binary form.
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:rtype: byte string
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Nz MAC is unsafe for this messager ó r r )r# r$ r% r5 r& Ú
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ValueErrorr2 r r4 r, r1 r3 r- r* r+ r )r7 r ÚptÚpartials r Údigestz CMAC.digest· só ð × Ñ à ==Ð $¨T×-FÒ-FØ==Ð à ??T^^Ò +Ü Ð =Ó>Ð >à ==AÒ $§/¡/°AÒ"5ä t§x¡xÓ0Bð kk¡!nGØ&-°¸2ÀÇ Á Ñ;MÐPQÑ;QÑ0RÑ&RGDMMNÐ #Üt}}¨gÓ6¸¿¹ÓABà ×)Ñ)¨"Ó-Ð.?¨t×/?Ñ/?Ð@ à}}Ð r c ó dj t | j « « D cg c] }dt |« z c}« S c c}w )zÓReturn the **printable** MAC tag of the message authenticated so far.
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:return: The MAC tag, computed over the data processed so far.
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Hexadecimal encoded.
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:rtype: string
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Ú z%02x)ÚjoinÚtuplerW r )r7 Úxs r Ú hexdigestzCMAC.hexdigestÕ sD ð wwÜ!& t§{¡{£}Ó!5ö7Ø ð ¤ a£Ó(ò 7ó 8ð 8ùò 7s §Ac óî t d« }t j d||¬« }t j d|| j « ¬« }|j « |j « k7 r t d« y)ag Verify that a given **binary** MAC (computed by another party)
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is valid.
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Args:
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mac_tag (byte string/byte array/memoryview): the expected MAC of the message.
|
|
Raises:
|
ValueError: if the MAC does not match. It means that the message
|
has been tampered with or that the MAC key is incorrect.
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r é )Ú digest_bitsr8 ÚdatazMAC check failedN)r r r( rW rT )r7 Úmac_tagÚsecretÚmac1Úmac2s r Úverifyz CMAC.verifyà s] ô " "Ó%ä{{ s°¸WÔEÜ{{ s°¸T¿[¹[»]ÔKà ;;=DKKMÒ )Ü Ð /Ó0Ð 0ð *r c óJ | j t t |« « « y)al Verify that a given **printable** MAC (computed by another party)
|
is valid.
|
|
Args:
|
hex_mac_tag (string): the expected MAC of the message, as a hexadecimal string.
|
|
Raises:
|
ValueError: if the MAC does not match. It means that the message
|
has been tampered with or that the MAC key is incorrect.
|
N)rf r r )r7 Ú hex_mac_tags r Ú hexverifyzCMAC.hexverifyô s ð Ig kÓ 2Ó3Õ4r ) Ú__name__Ú
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__module__Ú __qualname__Ú__doc__r rA r6 rE rP rW r] rf ri © r r r r ) s8 ñð Kò: òx òD>ò"ò* ò< 8ò1ó( 5r r c óä | t d« |i n
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t |« }| |j }|dk r t d« ||j kD rt d|j z « t | |||||« S )a Create a new MAC object.
|
|
Args:
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key (byte string/byte array/memoryview):
|
key for the CMAC object.
|
The key must be valid for the underlying cipher algorithm.
|
For instance, it must be 16 bytes long for AES-128.
|
ciphermod (module):
|
A cipher module from :mod:`Crypto.Cipher`.
|
The cipher's block size has to be 128 bits,
|
like :mod:`Crypto.Cipher.AES`, to reduce the probability
|
of collisions.
|
msg (byte string/byte array/memoryview):
|
Optional. The very first chunk of the message to authenticate.
|
It is equivalent to an early call to `CMAC.update`. Optional.
|
cipher_params (dict):
|
Optional. A set of parameters to use when instantiating a cipher
|
object.
|
mac_len (integer):
|
Length of the MAC, in bytes.
|
It must be at least 4 bytes long.
|
The default (and recommended) length matches the size of a cipher block.
|
update_after_digest (boolean):
|
Optional. By default, a hash object cannot be updated anymore after
|
the digest is computed. When this flag is ``True``, such check
|
is no longer enforced.
|
Returns:
|
A :class:`CMAC` object
|
z%ciphermod must be specified (try AES)é z,MAC tag length must be at least 4 bytes longz>MAC tag length cannot be larger than a cipher block (%d) bytes)r' Údictr" rT r )r8 r9 r: r; r< r= s r r( r( s ð@ ÐÜÐ?Ó@Ð@à'Ð/B´T¸-Ó5HMàØ×&Ñ&à{ÜÐGÓHÐHà×%Ñ%Ò%ÜÐYÐ\e×\pÑ\pÑpÓqÐqä S) ]°GØ#ó %ð %r )r )NNNNF)Úbinasciir Ú Crypto.Hashr ÚCrypto.Util.strxorr ÚCrypto.Util.numberr r ÚCrypto.Util.py3compatr r r
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